A State‐of‐the‐Art Cyanation of Aryl Bromides: A Novel and Versatile Copper Catalyst System Inspired by Nature

Abstract A general protocol for the cyanation of aryl halides with the nontoxic cyanide source K 4 [Fe(CN) 6 ] using copper catalysis and a ligand system based on 1‐alkylimidazoles is presented. The advantages of this system are the high selectivity, a unique substrate range, easy handling, and inexpensive reagents.